Open AccessSOME OBSERVATIONS ON THE NUCLEAR ENVELOPE
Author(s) -
W. Gordon Whaley,
Hilton H. Mollenhauer,
James H. Leech
Publication year - 1960
Publication title -
the journal of cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.414
H-Index - 380
eISSN - 1540-8140
pISSN - 0021-9525
DOI - 10.1083/jcb.8.1.233
Subject(s) - cytoplasm , biology , envelope (radar) , inner membrane , microbiology and biotechnology , nuclear lamina , nucleus , nuclear pore , classification of discontinuities , biophysics , membrane , endoplasmic reticulum , lamin , nuclear protein , biochemistry , mitochondrion , telecommunications , mathematical analysis , radar , mathematics , computer science , transcription factor , gene
In maize root meristem cells, fixed in KMnO(4), embedded in epoxy resin, ultrathin sectioned, and studied with an electron microscope, the nuclear envelope is demonstrated to be a double membrane structure. In the nuclear envelope there are: pores of the sort reported in many species of animals and plants; different types of openings associated with extensions of both nuclear membranes into the cytoplasm; and also, often, large discontinuities. The nuclear envelope is a component of the general vesicular reticulum. The reticula of neighboring cells including the nuclear envelopes make up, at certain stages at least, a "systemic" structure. The status of the nuclear envelope as a component of the general cellular reticulum is recognized to change during differentiation. The existence of several types of discontinuities in the nuclear envelope and the extent of nuclear-cytoplasmic surface relationships indicated suggests alteration in concepts of transport and exchanges between nucleus and cytoplasm.
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